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Ferromagnetism in diluted magnetic semiconductors at low carrier density
Author(s) -
Dugaev V. K.,
Litvinov V. I.,
Barnaś J.,
Slobodskyy A. H.,
Dobrowolski W.,
Vieira M.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301715
Subject(s) - curie temperature , condensed matter physics , ferromagnetism , magnetic semiconductor , impurity , materials science , semiconductor , exchange interaction , curie , magnetic field , physics , quantum mechanics , optoelectronics
We present a general approach to the problem of a ferromagnetic phase transition in diluted magnetic semiconductors with free carriers. The Curie temperature of ferromagnetic transition is calculated in the mean field approximation. The approach allows to analyze the effects of magnetic fluctuations and disorder on the Curie temperature. We also propose a new mechanism of exchange interaction between magnetic impurities at vanishing concentration of free carriers.